The Natal Government Railways Class K 0-4-0ST of 1891 was a South African steam locomotive from the pre-Union era in the Colony of Natal. In 1891, the Natal Government Railways placed five 0-4-0ST locomotives in service as shunting engines. One was later sold to the Pretoria-Pietersburg Railway, while two more went to the Harbour Board of Natal. In 1905 or 1906, the remaining two of these locomotives became part of the Natal Class K. By 1912, four of these locomotives survived to come onto the roster of the South African Railways as unclassified obsolete locomotives.